Nonreturn valve



Nov. 6, 1923. 1,473,155

c. F. MATTINGLY ET AL NONRETURN VALVE Filed May 29 1922 Patented Nov. 6, 1923.

UNETE' ATEfi l e'i i lgd CHARLES F. IvIATTINGLY, OF MAPLEWOOD, AND CECIL F. MONTGOIJIERY, OF ST. LOUIS, MISSOURI, ASSIGNORS TO MATTINGLY AUTOMATIC VALVE 00., OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

NONRETURN VALVE.

Application filed May 29,

To all whom it may concern:

Be it known that CHAnLns F. lilA'r'rINeLY and CEciL F. MONTGOMERY, citizens of the United States residing at Maplewood, in the county of St. Louis and State of Missouri, and St. Louis, State of lilissouri, respectively, have invented certain new and useful Improvements in Nonreturn Valves, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in non-return valves and has relation more particularly to a device of this general character of an automatic typeand it is an object of the invention to provide a novel and improved device of this general character which is particularly designed and adapted for use for shutting off the flow of gas from the tank of an oXy-acetylene apparatus in case the hose is bursted, burned into or ruptured from any 0 use and which also operates to prevent fire from. going back into the tank in the event of a flashback or back fire of the torch.

The invention consists in the details of construction and in the combination and arrangement of the several parts of our improved nonreturn valve whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of our invention will hereinafter be definitely claimed.

In order that our invention may be the better understood, we will nowproceed to describe the same with reference to the accompanying drawings, wherein Figure 1 is a view partly in section and partly in elevation illustrating a non-re turn valve constructed in. accordance with an embodiment of our invention;

Figure 2 is a View partly in section and partly in top plan of the bushing and valve associated therewith; and

Figure 3 is a view in elevation of the outer end of the structure illustrated in 'Zs disclosed in the accompanying drawings, .C denotes a casing herein shown as substantially L-sh'aped in form and which has one. end portion lqinternally threaded 1922. Serial No. 564,371.

main valve seat 3 with which co-acts a main valve a. The valve 4 is secured to an end portion of avalve stem 5 which has its inner end portion or its end portion remote from the valve -flthreaded into or otherwise engaged with a fulcrum piece or block 6. The block 6 is pivotally engaged as at 7 with an end portion of a link 8. The center portion of the link 8 is pivotally engaged as at 9 with a pin or a member a which intersects the body of the casing C.

The wall of the casing C, remote from the end portion '1 and at a point thereabove is provided. with an opening 10 in which is threaded a bushing 11, the bore of said bushing being preferably cylindrical. Freely disposed through the bore 12 of the bushing 1 is an elongated stem 13 angular in cross section and preferably square. The inner end portion of the stem 13 is provided with a valve let which co-acts with the valve seat 15 arranged at the inner end of the bore 12. The stem 13 is provided with an extension disposed in advance of the valve 14. said extension being bifurcated with the kerf 16 thereof bridged by the pin 17, said pin being spaced a desired distance from the valve 14L. A second end portion of the link 8 extends through the kerf 16 between the pin 17 and the valve 14- so that the valvcs 4c and 14 will be caused to move in unison but in reverse direction.

The bore 12 of the bushing llaifords oiin'n'nunicatiou between the atmosphere and he bore of the casing C and the stem 13 is of a length to extend exteriorly'of the casing C and beyond the bushing 11 and the exterior end portion of the stem '13 is provided with a ring 18 or the like to provide means whereby the valves 4: and ll may be manually operated when required. The end portion 2 of the casing C is provided with an internal valve seat 19 with which co-acts a ball valve 20, said ball valve moving away from its seat upon the pressure of the, fluid passing through the casing to permit free and unobstructed flow of such fluid through the casing C. The ball valve 20 drops to its seat 19 upon back pressure or when the pressure within the casing inwardly of the Valve seat 19 is materially reduced. The

ball valve 20 is held in place by meansot the,

rivet or pin 21 which intersects the end portion 2 ot' the casing C to force no undue ohstruction or hindrance of the flow through said casing.

Then the valve 4 is in closed position or resting against its seat 3, the valve 14 is in open position or off its seat 15. When it is desired to use the torch or to permit a flow through the casing C the stem 13 is pulled outwardly, which action seats the valve 14 and moves the valve 4 into open position. As the pressure builds up in the hose H the pressure also builds up within the body-portion of the casing G, which pressure serves to hold the valve 4 in open position and the valve 14 tightly against its seat.

As the area around the valve 4 is smaller than the cross sectional area of the bore or passageway within the body of the casing C or the corresponding area of the hose or pipe H it will be readily seen that were it not forv the pressure acting against the valve 14, the velocity of the pressure passing around the valve 4, would quickly force said valve v4 to its sea-t and stop the fiow. However, the. area around the valve 4 is larger than the cross sectional area of the nozzle or tip of the torch being operated and therefore the torch may be employed without creating any reduction of pressure in the hose or pipe H and consequently the valve 4 will not move into closed position and the ball valve 19 will remain ofl its seat 20 while the torch is being used. When the torch is shut off the pressure will equalize on each side of the ball valve 19 whereupon said valve 19 will fall to its seat 20 by gravity. However, the main purpose of the ball valve 19 is to prevent tire from running back into the tank and especially in case of flash back or back lire of the torch.

Should the hose become burned in two or ruptured from any cause as is often the case, the pressure which has been built up in the hose or pipe H andwithin the casing C will suddenly reduce. This reduction will. lessen or relieve the pressure on. the valve 14 which Was holding it to its seat 15 and, as the areaaround the valve 4 is not large enough to allow pressure enough :to pass around it to supply the opening caused by th hursted hose .or pipe H, the velocity of the gas or fluid -,pass ing around said valve 4 and the essive torce of the gas or fluid lgeinaini-ng av thin the tank or other source Y force the valve .4 to its seat ebv clas t e ement mim h e tan-.1; nd h s In case of flash back or back tiring, which must begin in the torch, as this is the only place where the two gases come in contact with each other, the instant the flash back or back tire begins it will create a pressure inthe hose or pipe H which will overcome the pressure of the gas which is passing around the ball valve 19 and as soon as this pressure equalizes the ball valve 19 will fall to its seat and thus prevent the passage of the fire back through the casing C.

.From the foregoing description it is thought to be obvious that a. non-return valve constructed in accordance with our invention is particularly welladapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that our invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason we do not wish to be understood limiting ourselves to the precise arrangen'ient and formation of the several parts'helei-n shown in carrying out our invention in practice except as hereinafter claimed.

e claim:

l. A valve of the class described compris ing a casing, one end of which being adapted for communication with a source of alluid under pressure, the bore of said casing inwardly of its opposite ends being provided with internal valve seats, the portion of the bore of the casing inwardly of the seat in the induction end of the casing constituting a pressure chamber, argravity seating valve co-acting with the second internal valve seat, the pressure within the casing serving to lift said valve from its seat, a wall ,of the casing being provided with a port in -com munication with the pressure chamber vof the casing and with the atmosphere, a valve coacting with the port, a valve .co-acting with the internal valve seat in the induction end of the casing, and means within the casing for connecting said last named valves for movement-in unison but in reverse directions, one of the valves being in open position when the other is in closed position.

2. A valve of the class described com-pris ing a casing, one endot which being adapted for communication with a source of fluid under pressure, the bore of said casing inwardly-oat its opposite ends being provided with internal valve seats, the portion otthe bore of the casing inwardly of the seat in v.1e port, a valve ceaact-ing' with the internal valve seat in the induction end of the casing, means within the casing for connecting said last named valves for movement in unison but in reverse directions, one of the valves being in open position when the other is in closed position, and the stem associated with the valve coact-ing with the port and extending through the port exteriorly of the casing, said stem providing means for manually moving the last named valves.

3. A valve of the class described co1nprising a casing adapted for communication with a source of fluid under pressure, the bore of said casing being porvided with an internal valve seat, the portion of the bore at the induction side of the valve seat constituting a pressure chamber, a wall of the casing being provided with a port in communication with the bore of the casing outwardly of the internal valve seat, a valve coacting with the'internal valve seat, a valve coacting with the port, a member positioned within the casing and extending diametrically thereacross from one wall of thecasing to another, a link arranged within the casing and pivotally supported between its ends by the member, the opposite end portions of the link being operatively engaged with the valves to cause the valves to move in unison but in reverse directions.

' 4. A valve of the class described comprising a casing, one end of which being adapted for communication with a source of fluid under pressure, the bore of said casing inwardly of its opposite ends being provided with internal valve seats, the portion of the bore of the casing inwardly of the seat in the induction end of the casing constituting a ressure chamber, a gravity seating valve co-acting with the second internal valve seat, the pressure within the casing serving to lift said valve from its seat, a wall of the casing being provided with a port in communication with the pressure chamber of the casing and with the atmosphere, a valve co-acting with the port, a valve co-acting with the internal valve seat in the induction end of the casing, means within the casing for connecting said last named valves for movement in unison but in reverse directions, one of the valves be ing in open position when the other is in closed position, and means for limiting the movement of the gravity valve away fromcoacting with the internalvalve seat, a valve coacting with the port, a member positioned within the casing and extending diametrically thereacross from one wall of the casing to another, a link arranged within the casingand pivotally supported between its ends by the member, the opposite end portions of the link being operatively engaged with the valves to cause the valves to move in unison but in reverse directions, the connection between the link and one or" the valves comprising a bifurcated extension carried by said valve, a pin bridging the kerf of the bifurcation and spaced from the valve, an end portion of the link extending between the pin of the extension and the valve.

6. A valve of the class described comprising a casing adapted for communication with a source of fluid under pressure, the bore of said casing being provided with an internal valve seat, the portion of the bore at the induction side of the valve seat constituting a pressure chamber, a wall of the casing being provided with a ort in communication with the bore of the casing outwardly of the internal valve seat, a valve coacting with the internal valve seat, a valve coacting with the port, a member positioned within the casing and extending diametrically thereacross from one wall of the easing to another, a link arranged within the casing and pivotally supported between its ends by the member, the opposite end portions of the link being operatively engaged with the valves to cause the valves to move in unison but in reverse directions, and means for manually moving the valves.

In testimony whereof they hereunto aflix their signatures.

CHARLES F. MATTINGLY. CECIL F. MONTGOMERY. 

